J
John Larkin
Guest
On Mon, 17 Jun 2019 08:27:49 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:
I was thinking of some sort of once-use tank, like a propane cylinder,
that wouldn't need a compressor and stuff. Gas from tank goes into
expander/cooler and then gets dumped, not circulated.
Compressed air is often available, but tends to be wet and would gunk
up an expander.
Water would be a great cooler for the peltier, but it's messy.
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
<langwadt@fonz.dk> wrote:
mandag den 17. juni 2019 kl. 17.12.41 UTC+2 skrev John Larkin:
On Mon, 17 Jun 2019 06:22:13 -0700 (PDT), George Herold
gherold@teachspin.com> wrote:
On Monday, June 17, 2019 at 5:53:55 AM UTC-4, Martin Brown wrote:
On 15/06/2019 18:15, George Herold wrote:
On Friday, June 14, 2019 at 10:36:33 PM UTC-4, Winfield Hill wrote:
George Herold wrote...
So melting my beer can of ice is about
1 kJ a watt for 1k seconds.
Oh great, 1k seconds? Why not just stand
there and breathe on it?
Well when cooling with the hot plate air cooled,
the hot side of the TEC is ~35- 40 C... and that
limits the minimum temperature of the cool side.
To get to lower temperatures I was thinking ice cooling.
What are you trying to do?
Well, we've been crazy busy here, building and testing. But I look to
be caught up soon, and I'm thinking again of my spad thing. (cooled
single photon detector.)
A single TEC stage needs a little more umph (cooling power). Double stages
get a bit more, but are trickier, (and I've never used one.) and
also want to live in vacuum... which is a complication.
I might gain another ~20C in cooling with ice on the cold plate.
I am worried about the whole condensation issue though.
George H.
Are you going to force those poor physics students to empty beer cans?
How about some gas expansion thing instead of the TEC?
Propane makes a great expansion cooler, between explosions.
here most if not all refrigerators use propane aka R290 as refrigerant
I was thinking of some sort of once-use tank, like a propane cylinder,
that wouldn't need a compressor and stuff. Gas from tank goes into
expander/cooler and then gets dumped, not circulated.
Compressed air is often available, but tends to be wet and would gunk
up an expander.
Water would be a great cooler for the peltier, but it's messy.
--
John Larkin Highland Technology, Inc
lunatic fringe electronics